﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FreeRedis
{
    partial class RedisClient
    {
        public FreeRedisClusterCRC16 ClusterCRC16  = new FreeRedisClusterCRC16();
    }

    public class FreeRedisClusterCRC16
    {
        private int[] LOOKUP_TABLE = new int[]
        {
            0, 4129, 8258, 12387, 16516, 20645, 24774, 28903, 33032, 37161, 41290, 45419, 49548, 53677, 57806, 61935,
            4657, 528, 12915, 8786, 21173, 17044, 29431, 25302, 37689, 33560, 45947, 41818, 54205, 50076, 62463, 58334,
            9314, 13379, 1056, 5121, 25830, 29895, 17572, 21637, 42346, 46411, 34088, 38153, 58862, 62927, 50604, 54669,
            13907, 9842, 5649, 1584, 30423, 26358, 22165, 18100, 46939, 42874, 38681, 34616, 63455, 59390, 55197, 51132,
            18628, 22757, 26758, 30887, 2112, 6241, 10242, 14371, 51660, 55789, 59790, 63919, 35144, 39273, 43274,
            47403, 23285, 19156, 31415, 27286, 6769, 2640, 14899, 10770, 56317, 52188, 64447, 60318, 39801, 35672,
            47931, 43802, 27814, 31879, 19684, 23749, 11298, 15363, 3168, 7233, 60846, 64911, 52716, 56781, 44330,
            48395, 36200, 40265, 32407, 28342, 24277, 20212, 15891, 11826, 7761, 3696, 65439, 61374, 57309, 53244,
            48923, 44858, 40793, 36728, 37256, 33193, 45514, 41451, 53516, 49453, 61774, 57711, 4224, 161, 12482, 8419,
            20484, 16421, 28742, 24679, 33721, 37784, 41979, 46042, 49981, 54044, 58239, 62302, 689, 4752, 8947, 13010,
            16949, 21012, 25207, 29270, 46570, 42443, 38312, 34185, 62830, 58703, 54572, 50445, 13538, 9411, 5280, 1153,
            29798, 25671, 21540, 17413, 42971, 47098, 34713, 38840, 59231, 63358, 50973, 55100, 9939, 14066, 1681, 5808,
            26199, 30326, 17941, 22068, 55628, 51565, 63758, 59695, 39368, 35305, 47498, 43435, 22596, 18533, 30726,
            26663, 6336, 2273, 14466, 10403, 52093, 56156, 60223, 64286, 35833, 39896, 43963, 48026, 19061, 23124,
            27191, 31254, 2801, 6864, 10931, 14994, 64814, 60687, 56684, 52557, 48554, 44427, 40424, 36297, 31782,
            27655, 23652, 19525, 15522, 11395, 7392, 3265, 61215, 65342, 53085, 57212, 44955, 49082, 36825, 40952,
            28183, 32310, 20053, 24180, 11923, 16050, 3793, 7920
        };

        public int GetCRC16(byte[] bytes, int s, int e)
        {
            int crc = 0;

            for (int i = s; i < e; ++i)
            {
                crc = crc << 8 ^ LOOKUP_TABLE[(crc >> 8 ^ bytes[i] & 255) & 255];
            }

            return crc & '\uffff';
        }

        public int GetSlot(string key)
        {
            return RedisClient.ClusterAdapter.GetClusterSlot(key);
        }

        public int GetCRC16(byte[] bytes)
        {
            return GetCRC16(bytes, 0, bytes.Length);
        }

        public int GetCRC16(string key)
        {
            byte[] bytesKey = Encoding.UTF8.GetBytes(key);
            return GetCRC16(bytesKey, 0, bytesKey.Length);
        }
    }
}